How do you guys think Dick Grayson will come along in this universe? Batgirl will probably come first like in The Batman but Dick will have to be introduced eventually.

It's anyone's guess at this point. I think they will remain somewhat faithful to the general idea (the Graysons being killed, Bruce taking him in and so on) because it doesn't seem like they want to reinvent the whole thing but rather to modernize it a bit and start with a clean slate. I suspect that if they keep the idea that Bruce adopts and trains him he will come into the story later because at this point Bruce himself is pretty young and very inexperienced. It seems that Batgirl will definitely come first.